Property Changes of SiO₂ Aerogel on Insulation Performance under Different Time and High Temperature Condition

Abstract:

To study the impacts of structural change of SiO₂ aerogel on its insulating properties, the samples were treated in long time (0-12h) at 500°C, 600°C, 700°C and 800°C. The results show that with the time increased, the shrink extends in thickness, the weight loss and the density is basically unchanged under the 500°Cand 600°C. As for 700°C and 800°C, the results were treated with 0-12h, the shrink extends in thickness, the weight loss and density increases considerably. Besides, the structure and composition of SiO₂ aerogel after the different temperature treaded with 0.5h were tested. The results show that when the heat treatment temperature is between 200-800°C, the small pores in SiO₂ aerogel collapses and large pores increase, and the density is stil1 able to maintain the 1ow value due to the unbroken skeleton. When the heat temperature is between 800-1000°C, the secondary particle size increases and the rnutual integration of the secondary particles occurs, the density will be significantly increased.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 349-352
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.349
• Online since: March 2014
• Authors: Jie Yang*, Jing Liu, Xue Ye Sui, Rui Xiang Liu, Chang Ling Zhou, Yan Hong Lv, Shou Wang, Shou Xing Wang, Ming Ling Wei
• Keywords: Insulation Property, Insulator, SiO₂ Aerogel, Structural Change

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